#include <stdio.h>
//t;x(char*s){*s&1&&(t+=2);return--t?*s&&x(s+1):*s&&!1[s];}
t;x(char*s){t+=*s%2*2;return--t?*s&&x(s+1):*s*!1[s];}
int main(void) {
char text[100];
while ( scanf("%s", text
) != EOF
) { t^=t;
}
return 0;
}
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